It's a pretty simple question but I can't find it anywhere. Where do I put the HTML code from a plug-in in TileMill?
For example this one: https://www.mapbox.com/mapbox.js/example/v1.0.0/leaflet-heat-markers/
Thanks!
Mapbox.js plugins are meant to be used with Mapbox.js, rather than TileMill. Mapbox.js is a library for integrating maps into your website, whereas TileMill is a tool for designing those maps.